Linux vs. Catamount running ocean modeling application
This chart provides an example of the performance gains one can achieve using an HPC-tuned operating system vs. a full-blown operating system on compute nodes. The chart compares the performance of various phases of the Parallel Ocean Program (POP) running on un-tuned Linux and on Catamount, on identical hardware. (POP is a component of the Community Climate System Model, or CCSM.)
The first phase, Baroclinic, performs a finite difference computation across the entire 3-D grid. It includes only nearest-neighbor communication and has relatively light synchronization requirements. This part of the computation demonstrates good scaling on both Linux and Catamount. However, when we turn to the Barotropic phase of the computation, which presents the most difficult challenge to scaling, we see more significant performance improvement from Catamount.
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